added comments

main/collision_rect.h

+/*******************************************************************
+    Header for collision_rect.c
+    File representing collision rectangle
+    authors: Pelech Ondrej, Pham Thi Thien Trang 
+    date:  May 2023
+ *******************************************************************/
+
 #ifndef __COLLISION_RECT_H__
 #define __COLLISION_RECT_H__
 
@@ -11,6 +18,7 @@ typedef struct collision_rect{
     int16_t height;
 } collision_rect_t;
 
+// checks for object collisions
 bool check_collision_rect(collision_rect_t* rect1, collision_rect_t* rect2);
 
 #endif 
\ No newline at end of file